指出东风4 型机车柴油机密封盖漏油的 3种原因 ,针对密封盖与曲轴输出端轴颈结合处漏油介绍了组装调整时应严格遵守的 4条原则。按上述原则调整的柴油机密封盖漏油问题得到了解决 It is pointed out that there are three reasons for the leakage of the seal cover of diesel locomotive for DF4 locomotive. The four principles that should be strictly observed in the assembly and adjustment are introduced in view of the oil leakage at the joint between the seal cover and the journal at the output end of the crankshaft. According to the above principles to adjust the oil seal leak problem has been solved